Steam-superheater.



P. THOMSEN.

STEAM SUPERHEATER.

APPLICATION FILED 001'. 29, 1912.

Patented Sept. 30, 1913.

INVENTOR WITNESSES ATTORNEYS vers for locomotiveand like boilers.

UNITED s'rAtrE-s rarnnrr OFFICE.

rn'rnn rn'omsnn, or oassnn-w nnnmisnonn, GERMANY, ASSIGNOR r0 scrrmnrscnn nnrssnamrr-cnsnnnscnnr'r ivrrr snsonnn'nnrna neurone, -o'r- CASSEL, ena- MANY, A CORPORATION or GERMANY.

' STEAIVFSUPERHEATER.

Specification of Letters Iatent. P te ted S t, 30, 9 3

. Application filed October 99, 191% Serial. No. 728,371.

To-all wh'om it may concern:

, Be'it known that I, Pn'rnn TI-IOMSEN', a subject of the Kmg of Prussia, Emperor of Germany, residing at 'Cassel-Wilhelmshohe Germany, have invented a certain new and useful Improvement in Steam-Superh eaters-,v

of which the following is a specification.

My invention relates to steam superheat- Tie superheater pipes in the type referred 'to are arranged in fire tubes usually of enlarged diameter and the object of the present invention is to prevent overheating of the superheater pipes under certain working conditions when no steam is passing through them;

The invention consists in arranging at the saturated steam header or its supply pipe a non-return valve or the like which is closed when steam is passing through the superheater and which opens when the steam is shut ofi so that when the engine is running with steam shut off, air will be drawn through the superheater-to cool'the tubes.

The invention also consists in the imroved superheaters hereinafter described or indicated.

Suchvalves are usually arranged on the valve chest or steam admission pipe of the engine, their object being to admit air into the cylinders when the engine is running with steam shut-oil, so as to prevent a braking action. By their new disposition, however, they are enabled to perform not only their original function but also the additional function of preventing overheating of the superheaters.

The accompanying drawing illustrates one form of the present invention. In carrying [at a thesuperhe'a'ter ipes f saturated steamflhejad the invention into effect according to this form, thesu erheater is shown applied to a locomotive, t e boiler of which is indicated passing from a er or c amber d into the enlarged smoke tubes 6- and so to the superheated steam header or chamber a. The chamber (1 is supplied with steam from the boiler in the usual manner through a regulator or throttle (not shown) controlling the flow of steam through a main steam pipe opening into the chamber (1.

amber is provided in connection with i saturated steam collector or header d.

This chamber maybe formed, for instance, by the valve seat on the end of a pipe-'71:, connected to the saturated steam .collector, and acap n, screwing over the valveseat and open to the atmosphere. In thischamher a suitable valve such as a ball valve Z- is arranged. vAs long as the englne receives steam through thesuperheatcr, the ball is forced upward and so prevents access of air to the superhcater. If, however, steam is shut oil", while the engine is runningythe ball fallsand rests on the valve seat above mentioned, which, as shown in the drawing, s provided with ports in such a manner that they cannot all be closed by the ball. As the piston reciprocates in the cylinder therefore air is sucked in past the valve and through the superheater pipes, thereby assisting to prevent over-heating.

It will be evident that the invention is in no way restricted to any particular form of norrreturn valve, that described above being merely by way of illustration of the present invention.

Having described my invention, I claim:

1. In a smoke tube boiler, superheater pipes in some of the smoke tubes, steam supply means connecting the boiler to the superheater pipes, and a valve in said steam supply means adapted to be opened or closed as to the atmosphere.

2. In a smoke tube boiler, superheater pipes-in some of the smoke tubes, steam supply means connecting the boiler to the superheater pipes, and a valve in said steam I supply means opening to the atmosphere,

said valve having means controlled by the steam pressure in said supply means for closing said valve. 1

3. In a boiler of the class described ha ing a super-heater provided With a saturated steam header, a superheated steamheader, and superheater pipes connecting said headers, an opening to the atmosphere be tween the boiler and the superheater pipes and means controlled by the'steam pressure for closing said opening. v

4. In a boiler of the class described having a superheater provided with a saturated steam header, a superheated steam header, and superheater pipes connecting said headers, a valve open to theatmospherebetween the boiler and the superheater pipes,

steam header, a superheated steam header,

and superheater pipes connecting said headers, a valve opening into the saturated steam header, and having automatic means for opening to the atmosphere when the v steam pressure is on and for closing to the atmos ere when the steam pressure is off.

6. In a boiler of the class described having a superheater provided with a saturated steam header, a superheated steam header, and superheater pipes connecting said headers, a non-return valve normally connecting the saturated steam header with the atmosphere and means actuated by the steam pressure for closing said valve.

ing witnesses.

ing a superheater provided with a saturated steam header, a superheated steam header, and superheater pipes connecting said headers, the combination of a pipe opening into' the saturated steam header and havin a ball normally resting upon the end of said pipe and incompletely closing the same, and a cap loosely embracing said ball and attached to the end of said pipe, said cap having an opening to the atmosphere and n a boiler of the class described havsaid ball being adapted to bemoved bythe 1 steam pressure to close said cap opening. In testimony whereof, I have hereunto set my hand in the presence of two subscrib- PETER THOMSEN.

Witnesses: I ARTHUR MARTIN,

CARL MoLL.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner. Patents,

\ Washington, D. G. 1 

